There is a young group in Lewiston and quite a few bars on Main Steet and nearby. I am an old geezer, so can't give you much more than that!
What day are you traveling? Here is a link to the Idaho Dept of Transportation cameras and road conditions. There is still snow up on Lolo Pass, but the road looks clear of snow at this moment. You would need to be cautious as there might be some ice on the road especially in shady spots or in corners. The road is beautiful, speed limit is slow...50 mph once you get past Kooskia. It is slow for a reason, so give yourselves time and dont get in a rush. (Wow, that is a real *Mom* statement isnt it?? lol) Stop at the Visitor Center at the top, nice bathrooms and a good place to stretch. On cold days they sometimes have a fire going.
Also check weather.com, click on weather alerts, click on Idaho to see if there are any winter weather warnings for that area. At present there are not, although there are some a bit further south of there.
Be careful of Highway 12 east of Lewiston as well. If you are early in the morning, be very careful of shady corners and icy patches. You don't want to wind up in the river.
Have fun on your break!!